I have no particular worries about regressions from Rielly, Brodie, Liljegren, Sandin or Holl. Rielly, Brodie and Holl haven’t shown any signs of slowing down to me (Holl, I don’t like his game, but that’s not new), and Sandin and Liljegren should be improving rapidly. No overly significant injuries in this group either - just some short term, not concerning stuff.
Gio is aging and could certainly drop off, but if he does, Sandin can replace him. Not worried.
Muzzin is the main concern - he’s the only punishing physical D we have. We can’t just say “replace Muzz with Sandin” the way we can say “replace Gio with Sandin”, as Muzz has a unique (and important) role on our team. He also DID slow down very noticeably last regular season, though got his game back to normal for the playoffs. Plus he seems to have a nagging injury. I’m legit concerned that he slows down further and can’t ramp it back up for the playoffs - may not happen, but it’s a risk.
Overall, I think we have a well above average D. Muzzin is a concern, but not enough to make the defence as a whole TOO concerning.
I do really like our depth. 7 strong dmen, and 2 more serviceable NHL dmen waiting in the wings (Benn/Mete), that’s very nice.